So I have a Cold Steel Leatherneck - one of the original FFG versions - in pristine unused condition. There is the smallest discoloration on the blade finish on one side up towards the spine of the blade. Every time I take the knife out of the sheath, there is very thin oil residue in that same specific area on the blade. Wipe the blade off, and a week or month later there's an oily spot on that part of the blade again. It doesn't rust at all so don't think it's anything else besides oil. Very weird. I've NEVER seen that on any other knife blade. It's like that one spot is weeping oil out of the steel. Do any of you have any ideas what it could be from or why it's happening?